%6tf Anal^fts of the Air, 
Experiment CXVI. 
I bored a hole in the fide of a large wooden 
foflet ab, (Fig. 39.) and glewed into it the 
great end of another foflet i covering the 
orifice with a bladder valve r : Then I fit- 
ted a valve b i, to the orifice of the iron 
fyphon f fy fixing the end of, the fyphpii 
fad at b into the foflfet a b : Then by means 
of narrow hoops I placed four "Diaphragms 
of flannel at half an inch diftance from each 
other, into the broad rim of a fieve, which 
was about 7 inches diameter. The fieve was 
fixed to, and had a free communication with 
both orifices of the fyphon, by means of 
two larg^ bladders / in no. 
The inftrument being thus prepared, pinch- 
ing my noftrils clofe, when I drew in breath 
with my mouth at Uy the valve i b being 
thereby lifted up, the air paflfed freely thro’ 
the fyphon from the bladders, which then 
fubfided, andfhrunk confiderably : But when 
I breathed air out of my lungs, then the 
valve i b clofing the orifice of the fyphon, the 
air paired thro' the valve r into the blad- 
ders, and thereby dilated them j by which 
^rtV 
